The basic build is now ready. Q key: rotate gravity clockwise E key: rotate gravity counter-clockwise W key: rotate gravity 180 degrees C key: debug movement
Updated the build to fix some bugs and simplify the structuring a bit. Also added some new objects to test. Just use the previous link above.
There isn't much to see that you'd want to try out. Aside from some internal restructuring and redesigns, it's functionally identical to the engine build I posted half a year ago, but with even less stuff to play around with.